Study on Energy Exchange of Dry-Land Spring Maize Field in Loess Plateau

Abstract:

Dry-land spring maize is a main cultivated crop in North-West China. To explore the mechanism for changes of evapotranspiration and heat consumption in dry-land spring maize, eddy covariance technique was used to monitor the energy-exchange characteristics of the crop in Eastern Loess Plateau field. The results showed that the field-energy-balance ratio of dry-land spring maize is in the 0.75 - 1.0 range during non-rainfall daily noon (12:00 - 14:00). The Bowen ratio exhibited "L-type" trend during the total growth stages, namely, the highest Bowen ratio was at seedling stage with phase average 4.85 ± 1.42. The evaporation fraction showed a single peak trend in August, and the higher evaporation ratio met with more precipitation with average values 0.55 ± 0.06. The Bowen ratio and average evaporation fraction at the entire growth period were 1.78 ± 1.71 and 0.40 ± 0.18, respectively. About 40% of surface energy obtained from drought agro-ecosystem was used for evapotranspiration and heat consumption.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 3771-3779
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.3771
• Online since: August 2013
• Authors: Jia Xuan Guo, Xu Rong Mei, Yu Zhong Li
• Keywords: Bowen Ratio, Dry-Land Spring Maize, Eddy Correlation Method, Evaporation Ratio

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